Quote:
Originally Posted by Steve Tinker
The "rough edge" on the bearing inner cover in picture #1 is interesting - looks like the steel has been acid etched.
Was this section of the cover positioned at the bottom - I seem to recall the the lower edge of the IMS is immersed in oil when the engine is stationary, so if the bearing was sitting in old, acidic oil for long periods, etching could occur.
It would be interesting to see if the bearing races were in a similar condition, but that would mean cutting it open to inspect .....
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That rough spot is just the raw casting, a low spot that wasn't touched by the machining operations.